ruby-on-rails - Rails 应用程序日志中的重复输出

Question

这是我的输出:

Cache read: views/c4f74176be2db099863b59e962270679
Cache read: views/c4f74176be2db099863b59e962270679
Read fragment views/c4f74176be2db099863b59e962270679 (0.3ms)
Read fragment views/c4f74176be2db099863b59e962270679 (0.3ms)
  Rendered planners/new.html.erb within layouts/application (12.0ms)
  Rendered planners/new.html.erb within layouts/application (12.0ms)
  Rendered layouts/_nav_bar.html.erb (1.3ms)
  Rendered layouts/_nav_bar.html.erb (1.3ms)
  Rendered layouts/_footer_bar.html.erb (0.1ms)
  Rendered layouts/_footer_bar.html.erb (0.1ms)
Completed 200 OK in 861ms (Views: 859.2ms | ActiveRecord: 0.7ms)
Completed 200 OK in 861ms (Views: 859.2ms | ActiveRecord: 0.7ms)

这是我的 gemfile:

source 'https://rubygems.org'
ruby '2.1.3'

gem 'rails',                    '4.2.0'
gem 'pg',                       '~> 0.18.1'
gem 'sass-rails',               '~> 5.0'
gem 'uglifier',                 '>= 1.3.0'
gem 'coffee-rails',             '~> 4.1.0'

gem 'jquery-rails'
gem 'turbolinks'
gem 'jbuilder',                 '~> 2.0'
gem 'sdoc',                     '~> 0.4.0', group: :doc
gem 'paperclip',                '~> 4.2.1'
gem 'faker',                    '~> 1.4.2'
gem "twitter-bootstrap-rails",  '~> 3.2.0'
gem 'bootstrap_form',           '~> 2.2.0'
gem 'bcrypt',                   '~> 3.1.7'
gem 'unicorn',                  '~> 4.8.3'
gem "therubyracer",             '~> 0.12.1'
gem "less-rails",               '~> 2.6.0'
gem "rails_12factor",           '~> 0.0.3'
gem 'aws-sdk',                  '~> 1.5.7'
gem 'omniauth-twitter',         '~> 1.1.0'
gem 'figaro',                   '~> 1.1.0'
gem 'responders',               '~> 2.1.0'
gem 'faraday',                  '< 0.9.0'
gem 'rest-client',              '~> 1.7.3'
gem 'bootstrap-datepicker-rails'
gem "dalli"


group :development, :test do
  gem 'simplecov',              '~> 0.9.1'
  gem 'pry',                    '~> 0.10.1'
  gem 'pry-byebug'
  gem "factory_girl_rails",     '~> 4.0'
  gem 'web-console',            '~> 2.0'
  gem 'spring',                 '~> 1.2.0'
  gem 'capybara',               '~> 2.4.4'
  gem 'mocha',                  '~> 1.1.0'
  gem 'launchy',                '~> 2.4.3'
  gem 'capybara_minitest_spec'
  gem 'database_cleaner',       '~> 1.4.0'
  gem 'quiet_assets'
  gem 'awesome_print',          require: "ap"
  gem 'vcr'
end

出于某种原因，我的输出加倍了，但它看起来只是输出加倍，而不是运行两次。我的 View 时间加载是相同的，所以看起来它只是一个 STDOUT double。这是怎么回事？

Answer 1

简答

限制 rails_12factor 仅用于生产:

gem "rails_12factor",           '~> 0.0.3', group: :production

长答案

命令 rails server 除了将日志发送到记录器之外，还将日志发送到标准输出。因此，如果您的记录器写入标准输出，每个条目将在终端上出现两次。

gem rails_12factor 将您的日志发送到标准输出。如果您在开发中使用它，并使用 rails server 启动您的环境，那么您会得到重复的日志。有关详细信息，请参阅此评论(及其线程):

• https://github.com/heroku/rails_12factor/issues/10#issuecomment-29522976

不过还有一个最后的障碍:在生产环境中使用 Rails 控制台时，我仍然可以看到重复的 SQL 输出(虽然不是在服务器日志中)。这个问题还在 Rails issue tracker 上讨论，似乎还没有解决方案。见:

• https://github.com/rails/rails/pull/14769
• https://github.com/rails/rails/issues/11415